navigator.clipboard is undefined

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This requires a secure origin — either HTTPS or localhost (or disabled by running Chrome with a flag). Just like for ServiceWorker, this state is indicated by the presence or absence of the property on the navigator object.

https://developers.google.com/web/updates/2018/03/clipboardapi

This is noted in the spec with [SecureContext] on the interface: https://w3c.github.io/clipboard-apis/#dom-navigator-clipboard

You can check the state of window.isSecureContext to learn if that’s the reason a feature is unavailable. Secure contexts | MDN

And yes, you should set up HSTS to make sure HTTP redirects to HTTPS.

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